Everything's a bit tighter... things don't wobble!' Kimberley Walsh displays the results of her theatre job in new Puma campaign

It appears as though all those gruelling hours onstage performing Shrek: The Musical are paying off for Kimberley Walsh.

The Girls Aloud star showcases a flat stomach as she high-kicks her way through a glamorous new ad campaign for Puma Bodytrain Spring/Summer 2012.

'Everything's a bit tighter, everything's a bit more compact,' the 30-year-old says. 'Things don't wobble, so that's got to be a bonus!'

 
Kimberley looks far more chic than most during her workout, with her perfectly tousled hair and fresh make-up.

Wearing a pink sports bra that shows off an enviably trim midriff, Miss Walsh gazes seductively at the camera as she lifts weights.

In another shot, she shows off her kickboxing prowess with a high-kick in black workout bottoms and a grey T-shirt.

'I work out two to three times per week, however before I was in Shrek I used to work out three to four times,' she says.

And stretch! Kimberley shows off moves she uses to warm up ahead of stage performances in the new ad campaign

'Currently I like to run outdoors, I'm not a fan of running in the gym because I get bored. By running outside I can be nosey and see what's going on. 

'My favourite workout at the gym is the free weights, it gives me the most rewards and makes me feel tightened and toned. I've recently got into Yoga and Pilates they both help me stretch out and I'm feeling much more flexible these days.

'Exercise makes me feel energetic and since working out I don't feel so tired. Exercise has made me more toned and has made me pretty strong which I'm proud about.'

The Shrek star also revealed that she enjoys working out with BFF Cheryl Cole, adding: 'She's really disciplined as well, so we kind of spur each other on.'

Kung fu kick: The Girls Aloud star showed off her kickboxing prowess

This week Cheryl told her friend off for not letting her in on her holiday plans.

When she heard Kimberley was taking off for a week, Cole wrote to her on Twitter: 'Erm. Where r you going from the 16th-22nd of April and why do I not know about it already.. #imallears *foldsarmstapsfoot*'

Kimberley replied: 'Ha ha Sal's doing a play in Sweden so I'm gonna visit her! Our holiday is gonna be when I finish *smiling* #loveourgirliehols,' referring to her sister Sally.

Cool down: The singer stretches out wearing lycra workout wear